Paper bag



Feb. 3, 1942. H. KINDSETH 2,271,647

PAQER BAGr Filed March' 10, 1938 u I j g raven or. F769 E65 I/ARoLD VJf/NDJETH ATTORNEY/J I mouth/into one or more of the bag top Patented Feb. 3, 1942 UNITED STATES. PATENT oFFice i M m vjinaseui, Minneapolis, Minn, minor.

I n Bemis Bro. Ba: rporation of M1890!i Minneapolis, Minm, a

Application March 10, 1938, Serial No. 195,083

1 Claim. (Cl. 22942) drawing and-will This invention relates to new and useful improvements in paper bags of the general type usually employed for packaging finely comminuted material such, for example, as sugar,

flour, corn meal, breakfast foods, and various other commodities.

In the operation of folding the walls of a bag sometimes difficult to make the closed bag tops uniform in appearance, because of the inherent nature of the paper. The walls of the empty bags are usually folded into fiatwise relation before the bags are filled, to facilitate stacking the empty bags, one upon another. Such folding and stacking of the empty bags may cause one or more be pointed out in the annexed claim.

In the accompanying drawing, there has beendisclosed a structure designed to carry out the 5 various objects'of theinvention, but it is to be closing and sealing relation, it is understood that the invention is not confined to the exact features shown as various changes ma; be made within the scope of the claim which follows. v

l0 In the drawing:

Figure 1 is a perspective view of an empty bag showing the invention embodied in a wall thereof;

Figure 2 is a view showing]: filled bag prior to.

having its open top closed; 3

vertical folds to be made in the walls of the bag.

These folds'may interfere somewhat with the folding of the bag top walls into closing relation,

Figure 3 is a view showingone of the bag mouth walls folded inwardly over the contents of the bag;

Figure 4 shows the next operation of closing the bag top, wherein it will be noted. that the partially closed top;

. Figure 6 shows the bag top after it has been .-completely closegl and sealed;

bag mouth walls into sealing relation, whereby all y 'of the sealed bag tops will be uniform and symmetrical, and neat in appearance.

A further object is to crimp or otherwise treat a portion of one or more of the walls of the bag mouth in the region of the level of the contents of the bag, whereby when said walls are folded inwardly over the material in the bag, the transverse folds provided therein will be substantially at right angles to the vertical axis of the bag body, whereby all of the closed bag tops will be uniform and substantially alike in appearance,

and whereby the perimeter of the closed bag top will be symmetrical about the median plane of the bag body.

A further and more specific object of the invention is to horizontally crimp or score an area of walls atthe point opposite end wall is folded inwardly over the first folded wall; 7 I

Figure 5 is-a top view applied to the laterally projecting fiaps'of the Figure 7 is an enlarged detail sectional view on the line 1--1 of Figure 2, showing how a portion of the paper is crimped or treated to facilitate bending or folding the bag mouth walls into closing and sealing relation;

Figure 8 is a .view showing both of the end walls of the bag horizontally crimped to facilitate 85 folding;

whereby they are bent or folded, when closing the bag top, perimeter of the tops will be uniform appearance.

Other objects of the invention will appear from bag top and whereby the sealed and substantially alike in .the following description and accompanying thereby to more sharply define the section, as best shown in Figure 6, but it is to be Figure 9 is a view showing the opposite side walls of the bag crimped; and

Figure 10 is a view showing the horizontal crimping of the bag. walls extending completely 40 around the circumference of the bag.

In the selected embodiment of the invention here shown, there is illustrated in Figure l, a bag of more or less conventional design, commonly known to the trade as a fla't bag, and comprising a body portion 2 provided with a suitable bottom 3. The bag, when empty, usually has its walls folded into flatwise relation, whereby a vertical fold 4 is provided at each side of the folded bag, as will be understood by reference to Figure 4.

When the empty bag is expanded, or opened up and has received a charge of material, as shown in Figure 2, the bag mouth is defined by end walls 5 and 6 and side walls I and 8. The

bag shown in the drawing is of rectangular crossof Figure 4, showing gum folding the end wall 5 and outwardly extending the side walls land 8, the end wall S-is folded inwardly over the.end wall 5, as best shown in Figure 4 and at the same time, oppositely extending flaps ID are proyided, as shown in Figure 5., The flaps III are then folded inwardly over the previously folded end walls, one over the other, as shown in Figure 6, whereby the operation of closing and sealing the bag mouth is completed. It is to be understood that portions of the bag top 'walls are suitably gummed, as indicated at H and I! in Figures 3 and 5, to prevent the folded bag top walls from unfolding. When the bag mouth walls have been folded into closing relation, as above described and as best illustrated .in Figure 6, the perimeter of the bag top is'defined by the ho'rizontaliy'disposed corners H and b-b, which must be properly disposed with respectto one another to provide a neat appearing bag top. In other words, the corners a-amust be parallel, and, in like manner, the corners b-b must be substantially parallel. The corners aa and b-b must also be I disposed in right angular relation in order that the perimeter of the closed bag top will bejisymmetrical about the median plane of the bag body.

I have found from actual experience, that the when said end wall is folded inwardly over the bag body, as shown in Figure 4, regardless of whetherthe bag top walls are folded by automatic machinery, or by manually folding them into closing and sealing relation, as shown in the patents to Daniel Belcher, 1,937,506, respectively. 7

In Figure 8, I have shown a bag having its oppositely disposed end walls I5 and I6 horizontally crimped, as shown at ll, thereby to facilitate inwardly folding said walls so that the comers H of the closed bag top will be substantially parallel and symmetrical to the median plane of the bag body.

In Figure 9, there is shown a bag having its oppositely disposed side wall I8 and I9 horizontally crimped or scored, as indicated at 20, and in Figure 10, "there is shown a bag whose upper wall portions are crimped, as shown at 2|, around the entire circumference of the bag. When the walls are thus horizontally crimped or scored, the walls, when folded into closing and sealing relation, will provide a bag top whose corners oa and bb will be disposed in right angularformation, whereby the bag top will be symmetrical about the medianplane of the bag body and will present a very neat appearance.

Crimping certain areas of the walls of the bag,

lfIo. 1,868,686 and No.

' as herein disclosed, adds very little to the cost vertical folds] in the bag walls, and also the conventional vertical ribbing or scoring of the bag walls, not shown, frequently causes the paper to fold along lines which are not parallel, or

symmetrically arranged with respect to the median plane of the bag body, whereby the completed bag top may become distorted and unsightly in' appearance. 7

To overcome this difliculty, I have found that by crimping one or more of the walls of the bag mouth in the-region of the level of the ,contents of the bag, as generally indicated by thenumeral ll in Figures 1, 2, 4, and 6, the objectionable feature, above referred to, is completely eliminated. In Figures 1 to 6, inclusive, there is illustrated a bag having a portion of .one of its walls horizontally crimped or scored at substantially the level of the contents of the bag body. This horizontal crimping of the bag mouth wall will cause said wall to fold or bend on a horizontal line,

of the bag and greatly facilitates the operation of folding the bag top walls into closing and sealing relation, and is an assurance that all'of the closed bag tops will be uniform and symmetrical in appearance.

In the accompanying drawing, I have shown the invention applied to a bag of the ilat type, but it is to be understood that the invention may be applied to other types of bags as, for example, those commonly known as intuck bags," whose end walls are tucked between the side walls, when 1 the bag is empty.

I claim as my invention:

A paper bag particularly for comminuted materials, comprising a bag body composed of a plurality of walls and upper folding portions integral with said walls for closing the bag, at least a portion'of awall of the bag body and its upper folding portion having a plurality of closely spaced and parallelhorizontally extending crimps defining an area of linear scores withinthe' range of the level of the material to be packed in the bag body to facilitate the closing of the bag along one of the score lines into a uniform and neatly closed bag with the perimeterof the closed bag symmetrical about. the top of the median plane of the bag body. v HAROLD V. KINDSETH. 

